Which of these characteristics is NOT associated with the evolution of heterospory in pteridophytes?
Reduction in the number of megaspores
Increased protection of the female gametophyte
Development of endosporic gametophytes
Increased dependence on water for fertilization
Related Questions
Pteridophytes are predominantly:
Homosporous
Heterosporous
Both homosporous and heterosporous
Neither homosporous nor heterosporous
Which of the following represents a heterosporous pteridophyte?
Selaginella and Salvinia
Psilotum and Lycopodium
Equisetum and Dryopteris
Adiantum and Pteris
The suspensor in Selaginella plays a crucial role in:
Anchoring the gametophyte to the substrate
Protecting the developing sporophyte
Facilitating spore dispersal
Pushing the developing embryo into the nutritive tissue of the female gametophyte
In which of the following pteridophyte pairs do both members exhibit heterospory?
Selaginella and Salvinia
Equisetum and Psilotum
Dryopteris and Adiantum
Lycopodium and Selaginella
What is the function of the prothallus in pteridophytes?
Produces spores
Bears the sexual organs
Anchors the plant
Conducts water
Given below are two statements : One labelled as Assertion A and the other labelled as Reason R:
Assertion A : The initial phase of the gametophyte in the moss life cycle is the protonema stage.
Reason R : Protonema arises directly from spores liberated from the capsule.
In the light of the above statements, choose the most appropriate answer from options given below:
Both A and R are true and R is the correct explanation of A
Both A and R are true but R is NOT the correct explanation of A
A is true but R is false
A is false but R is true
In pteridophytes, spores are produced in:
Antheridia
Archegonia
Sporangia
Rhizoids
Explain the role of the annulus in fern sporangia, contrasting its function with the role of elaters in liverworts.
Both annulus and elaters aid in nutrient absorption.
The annulus protects the developing spores, while elaters facilitate fertilization.
The annulus aids in spore dispersal in ferns by a spring-like mechanism, while elaters in liverworts are hygroscopic and facilitate spore dispersal by changing shape with humidity.
Both annulus and elaters are involved in anchoring the plant to the substrate.
The dominant photosynthetic phase in the life cycle of a Pteridophyte is the:
Gametophyte
Sporophyte
Prothallus
Sporophyll
The development of the zygote into a young embryo within the female gametophyte is a characteristic of:
Seed plants
Seedless vascular plants
Bryophytes
Green algae
